Multiple choice

John's sister's age is 10 years less than 5 times John's age. Sister's age is 7 years. Write the following statement in an equation.

  1. $10 + 5x = 7$
  2. $5x -10 = 7$
  3. $10 \times 5x = 7$
  4. $10 = 5x - 7$
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B Correct answer
Explanation

Let John's age be x. Sister's age = 5x - 10. Given sister's age is 7, so 5x - 10 = 7.

AI explanation

Let John's present age be x years. Five times his age is 5x, and 10 years less than this amount is written as 5x minus 10. Setting this expression equal to the sister's age of 7 years gives the equation 5x minus 10 equals 7.

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